You may want to check page 19 of the datasheet where they show a simple 100 Watt power amplifier. It looks to me like the feedback network values are wrong but it would be easy to correct.

G²

djk

6th February 2013 10:12 AM

19V/µS seems kind of slow for a ±70V amplifier.

Elvee

6th February 2013 10:32 AM

Could be improved in swing and linearity by boostrapping the 100K's

indianajo

6th February 2013 10:21 PM

10 ma max specified drive current, SOT or TSSOP package, heat sink on the bottom instead of a pad. Requires a LT1166 to make an audio amp, or two 2sk1057 and two 2sj1161 FET's for the 100 w version. Looks like it is useful only for big boys with a wave soldering machine. The existing TI/NatSemi LME49830 is a FET audio amp driver with a big heat tab an amateur can screw to a real metal heat sink.

Not the greatest choice for a composite amp control loop; the LTC6090 lacks the GBP to maintain consistent linearity across the audio band and the resulting lack of Avol shows in the THD+N plot. The

USE SEVERAL SERIES RESISTORS TO REDUCE DISTORTION (i.e. 5 × 2k).

note on page 17 (first post in this thread has a typo) of the LTC6090 datasheet is kind of entertaining, though. At 35V RMS (the amplifier's maximum output) the 10k feedback resistor would dissipate 245mW. Enough I suppose some thermal spreading would be useful.